Question 718425
x = the number


(x + 1)(x - 1) = 24   {one more than a number times one less than a number is 24}
x² - 1 = 25 {used foil method}
x² = 25 {added 1 to each side}
x = 5 or -5 {took the square root of each side}


the number could be 5 or -5
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